package dao;

import Demo523.SqlConnection;
import wlw.Users;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserDao {
    Connection connection=SqlConnection.getCon();
    public UserDao()throws SQLException,ClassNotFoundException{

    }
    public  int addUser(String username,String password)throws SQLException,ClassNotFoundException{
        Connection  connection = SqlConnection.getCon();
        String sql = "insert into users(username,password) values(?,?)";
        PreparedStatement  preparedStatement = connection.prepareStatement(sql);
        preparedStatement.setString(1,username);
        preparedStatement.setString(2,password);
        return preparedStatement.executeUpdate();
    }
    public Users login(String username,String password)throws SQLException,ClassNotFoundException{
        Users users =null;
        int i=1;
        Connection  connection = SqlConnection.getCon();
        String sql = "select * from users where username=? and password=?";
        PreparedStatement  preparedStatement = connection.prepareStatement(sql);
        preparedStatement.setString(1,username);
        preparedStatement.setString(2,password);
        ResultSet resultSet = preparedStatement.executeQuery();
        if (resultSet.next()){
            users = new Users();
            users.setId(resultSet.getInt("id"));
            users.setUsername(resultSet.getString("username"));
            users.setPassword(resultSet.getString("password"));
        }
        return users;
    }
    public int deleteUser(int id)throws SQLException,ClassNotFoundException{
        Connection  connection = SqlConnection.getCon();
        String sql = "delete from users where id=?";
        PreparedStatement  preparedStatement = connection.prepareStatement(sql);
        preparedStatement.setInt(1,id);
        return preparedStatement.executeUpdate();
    }

}
